Please include the status of the ntp-mode in the MQTT messages

[IdrinkOban]

Is your feature request related to a problem? Please describe.

No problem, just asking for a feature. Thank's for reading this.

Describe the solution you'd like

I would like to have the status of the NTP-mode (day/night) as part of the MQTT messages. This way, I can trigger some rules in OpenHAB based on these events or log the time of sunrise and sunset.

Example:

$ mosquitto_sub -v -t "hoymiles/dtu/mode"
hoymiles/dtu/mode day
hoymiles/dtu/mode night

Describe alternatives you've considered

No alternative so far.

Additional context

@tbnobody I have written 3 issues today. Sounds like a bad tempered, grumpy guy. ;-) Nothing could be further from the truth: I'm very happy with OpenDTU and I'm glad I found your project. It is adding a significant value to my solar!
I'm planning to add some documentation with schematics and pinout to your wiki.